If you have issue with site scrolling in Booster theme in high resolution monitors or in fullscreen mode, you just need to show more games in your theme homepage.

To show more games you need to make 2 small changes in some files in your Booster folder which is located in your /themes/ folder.

functions.php line 10:
define('_item_per_page', 40);

and

theme_setting.php line 3
define('_item_per_category_page', 40);

In both of those files, just increase "item per page" by changing the "40" to 50 or a bigger number to show more games in homepage and you be able to see and use vertical scroll bar. So you should have something like this:
define('_item_per_page', 50);